#sound {
    background-image: url(../images/sound_1920.jpg);
    height: 876px;
    background-position: center 50px;
}

@media screen and (max-width: 1366px) {
    #sound {
        background-image: url(../images/sound_1366.jpg);
        height: 717px;
        background-position: center 124px;
    }
}

@media screen and (max-width: 960px) {
    #sound {
        background-image: url(../images/sound_960.jpg);
        height: 674px;
        background-position: center 78px;
    }
}

@media screen and (max-width: 640px) {
    #sound {
        background-image: url(../images/sound_640.jpg);
        height: 648px;
        background-position: center 35px;
    }
}